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A Nonparametric Statistical Evaluation of Changes in Evoked Potentials to Different Stimuli
Author(s) -
Kohn Michael,
Lifshitz Kenneth
Publication year - 1976
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1976.tb00852.x
Subject(s) - psychology , stimulus (psychology) , audiology , nonparametric statistics , sensory system , stimulus modality , visual perception , population , auditory stimuli , perception , cognitive psychology , neuroscience , statistics , mathematics , medicine , demography , sociology
An experiment yielding the evoked electroencephalographic potentials (EPs) to seven different stimuli was conducted on a population of 13 female and 7 male normal subjects. Patterned‐visual, auditory and combined (bimodal) stimuli were used. One stimulus case required subject responses. Calculations of the first four statistical sample moments at the EP time points indicated nongaussian amplitude distributions. A nonparametric statistical test, the Mann‐Whitney (U‐test, was used to den it the significant point (p <.01) differences among the EPs to the visual, auditory and bimodal stimuli. The most extensive differences were obtained from EPs to stimulus pairs requiring subject response (identification). Differences among the EPs to different visual patterns existed to a lesser extent than to stimuli of different sensory modalities. In general, a change in the physical parameter of the stimulus induced changes in the earlier components, while the response requirement induced changes in the late components of the EP. No significant differences were found in EPs to the same stimuli between recording locations with hemispheric symmetry.